US5469183A - Synchronous display control apparatus - Google Patents

Synchronous display control apparatus Download PDF

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Publication number
US5469183A
US5469183A US08/077,250 US7725093A US5469183A US 5469183 A US5469183 A US 5469183A US 7725093 A US7725093 A US 7725093A US 5469183 A US5469183 A US 5469183A
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Prior art keywords
data
display
time delay
unit
intervals
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US08/077,250
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English (en)
Inventor
Ayako Takatsuji
Noritake Okada
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Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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Assigned to MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. reassignment MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: OKADA, NORITAKE, TAKATSUJI, AYAKO
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
    • H04M11/06—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors
    • H04M11/066—Telephone sets adapted for data transmision
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/40—Network security protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/131—Protocols for games, networked simulations or virtual reality

Definitions

  • This invention relates to a synchronous display control apparatus used in an intercommunication system for interchanging image information or plotting (writing) information among a plurality of communication terminals, and to the communication terminals used therein.
  • plotting data on a transmitting terminal display which is being drawn by a sender, is transmitted to an receiver and displayed on a receiving terminal display, so that both the parties can watch the same picture while talking to each other.
  • a data which has been outputted by the transmitting terminal but has not yet reached the receiving terminal and another data which has been already received by the receiving terminal are displayed distinguishably from each other on the transmitting terminal display, so that the parties can be freed from inconvenience caused by the disagreement about the plotting data on the display.
  • Another intercommunication system which is provided with a telephone set and a display unit, is disclosed in Japanese Laid-open Patent Application No. 2-084860. According to the system, various data processing programs can be used with the telephone set among a plurality of workstations or telecommunication terminals each provided with the multi-window system, so that intercommunication conference system can be realized.
  • a first object of this invention is to provide a synchronous display control apparatus capable of preventing inconvenience caused by the time delay between the display of data on a transmitting terminal and the display of the same data on a receiving terminal.
  • a second object of this invention is to provide a transmitting terminal capable of preventing inconvenience caused by the time delay between the display of data on the transmitting terminal and the display of the same data on a receiving terminal.
  • a third object of this invention is to provide a training method effective for preventing inconvenience caused by the time delay between the display of data on a transmitting terminal and the display of the same data on a receiving terminal.
  • the first object can be achieved by an apparatus for controlling synchronous display of data to be transmitted among a plurality of terminals interconnected over a communication line.
  • the apparatus comprises a data segmenting device for, in a transmitting operation, segmenting the data into a plurality of parts at predetermined intervals; a communication device for, in a transmitting operation, transmitting the segmented data to the receiving terminal and then receiving a reply therefrom every time a part of the segmented data has been visible on the receiving terminal display, and for, in a receiving operation, receiving the segmented data from the transmitting terminal and then transmitting a reply thereto every time a part of the segmented data has been visible thereon; a display device for visualizing the data; a display control device for, in a transmitting operation, controlling the display device to visualize the same part as is transmitted to the receiving terminal at first distinguishably from the other parts which are already visualized and then indistinguishably therefrom when the communication device receives a reply from the receiving terminal that the same part has been visible thereon
  • the data segment device may be composed of a division unit for dividing the data at predetermined intervals and a marker addition unit for adding a marker between each part of the segmented data.
  • the data to be displayed may be data string encoded by a predetermined encoding system, and the marker is a unique bit string different from the encoded data string.
  • the data to be displayed may be either plotting coordinate data string inputted through a coordinate input device or image data read out by an image reader device.
  • the apparatus may further comprise a one-part length determination device including the following units: a training data storage unit for storing training data; a one-part display time delay detection unit for detecting the time period from when one part of the training data that is added markers at a certain length of intervals is visualized on the transmitting terminal until the transitting terminal receives the reply from the receiving terminal that the same part as visualized on the transmitting terminal has been visible on the receiving terminal; a one-part display time delay judgement unit for judging whether the detected display time delay is within a permissible range or not; an interval shortening unit for shortening the intervals to add the markers when the display time delay is detected to be out of the permissible range; and a one-part interval control unit for controlling all of the one-part display time delay detection unit, the one-part display time delay judgement unit, and the interval shortening unit so as to display training data which is added markers at different length of intervals both on the transmitting and receiving terminals, the control being continued until the display time delay detected comes to be in the permiss
  • the one-part length determination device may further comprising the following units: an entire data display time delay judgement unit for judging whether the time delay for the entire training data is within a permissible range or not after the time delay detected by the one-part display time delay judgement unit is within the permissible range; an interval expansion unit for expanding the intervals to add the markers when the time delay for the entire training data is judged to be out of the permissible range; and a feedback control unit for controlling the training to adjust the intervals for adding markers to the training data at expanded intervals to be continued until both the one-part display time delay judgement unit and the entire data display time delay judgement unit judge the intervals to be optimum.
  • the one-part length determination device may be driven to transmit the training data prior to the data after the connection between the transmitting and receiving terminals is established.
  • the data segment device may own the same information on the intervals to add markers to data as the data segment device in the other terminal, and the data segment device, in a transmitting operation, may use the information only for the data to be transmitted to the display control unit of its own terminal, while in a receiving operation, it may use the information for the data transmitted from the transmitting terminal.
  • the display control device may control the display device to visualize the same part as is transmitted to the receiving terminal distinguishably from the other parts which are already visible by differentiating either tones or colors between them.
  • the second object can be achieved by a transmitting terminal connected with a receiving terminal over a communication line in a synchronous display system for displaying data to be displayed synchronously both on the transmitting terminal and the receiving terminal.
  • the transmitting terminal comprises: a data segment device for segmenting the data into a plurality of parts at predetermined intervals; a communication device for transmitting the segmented data to the receiving terminal and then receiving a reply therefrom every time a part of the segmented data has been visible on the receiving terminal display; a display device for visualizing the data; and a display control device for controlling the display device to visualize the same part as is transmitted to the receiving terminal at first distinguishably from the other parts which are already visualized and then indistinguishably therefrom when the communication device receives a reply from the receiving terminal that the same part has been visible thereon.
  • display data is segmented into a plurality of parts.
  • the transmitting terminal controls displaying a part by receiving a reply from a receiving terminal after the part has been visible on the display of the receiving terminal.
  • synchronous display of common data can be realized between the transmitting terminal and the receiving terminal.
  • the third object can be achieved by a training apparatus for setting intervals at which markers are added to data to be displayed, the apparatus being used in a synchronous display system for displaying the data synchronously both on a transmitting terminal and a receiving terminal among a plurality of terminals interconnected over a communication line.
  • the training apparatus comprises the following units: a training data storage unit for storing training data; a one-part display time delay detection unit for detecting the time period from when one part of the training data that is added markers at a certain length of intervals is visualized on the transmitting terminal until the transitting terminal receives the reply from the receiving terminal that the same part as visualized on the transmitting terminal has been visible on the receiving terminal; a one-part display time delay judgement unit for judging whether the detected display time delay is within a permissible range or not; an interval shortening unit for shortening the intervals to add the markers when the display time delay is detected to be out of the permissible range; and a one-part interval control unit for controlling all of the one-part display time delay detection unit, the one-part display time delay judgement unit, and the interval shortening unit so as to display training data which is added markers at different length of intervals both on the transmitting and receiving terminals, the control being continued until the display time delay detected comes to be in the permissible range.
  • the training apparatus may further comprise the following units: an entire data display time delay judgement unit for judging whether the time delay for the entire training data is within a permissible range or not after the time delay detected by the one-part display time delay judgement unit is within the permissible range; an interval expansion unit for expanding the intervals to add the markers when the time delay for the entire training data is judged to be out of the permissible range; and a feedback control unit for controlling the training to adjust the intervals for adding markers to the training data at expanded intervals to be continued until both the one-part display time delay judgement unit and the entire data display time delay judgement unit judge the intervals to be optimum.
  • a marker can be added to each end of the individual part of the segmented data at the optimum intervals, thereby further enhancing synchronism of data display.
  • FIG. 1 shows the construction of the synchronous display control apparatus of the embodiment of this invention.
  • FIG. 2 shows an example of marker-added data.
  • FIG. 3 shows another example of marker-added data.
  • FIG. 4 is a flowchart depicting the operation for adding markers of the embodiment.
  • FIG. 5 is a flowchart depicting the entire operation of the transmitting terminal.
  • FIG. 6 is a flowchart depicting the operation of the receiving terminal.
  • FIGS. 7A and 7B show the transition of plotting data visible on the transmitting terminal display and the receiving terminal display.
  • FIGS. 8A and 8B show the transition of image data visible on the transmitting terminal display and the receiving terminal display.
  • FIG. 1 shows the construction of the synchronous display control apparatus of this invention.
  • a transmitting terminal A and a receiving terminal B are both composed of the same units, so that the units of the transmitting terminal A only are described as follows:
  • a plot input unit 101 can be a key board, mouse, or electronic pen.
  • An image data storage unit 102 stores image data such as training data or still picture for transmission.
  • a telephone set 103 is used as a voice input/output device for users to intercommunicate via a communication unit 106.
  • a marker addition unit 104 at first segments the training data into a plurality of parts, adding a marker to each end of the individual part, and then outputs the marker-added training data to a data distribution unit 105. These marker addition/marker-added training data transmission are repeated using information on marker addition intervals sent from an appearance change permitting unit 109 as a parameter until the marker addition unit 104 receives a reply from the unit 109 that the training is over.
  • the marker addition unit 104 adds markers at the intervals used as the parameter to data to be transmitted.
  • the marker which indicates a boundary between each part of the data, can be a unique bit string which does not exist or defined in sign format for data to be transmitted.
  • FIG. 2 shows a 64-bit data added 16 consecutive zeros as the marker.
  • the data to be transmitted can be image data as well as plotting coordinate data, and the image data may have a more than 16-bit null pattern.
  • the marker addition unit 104 may input a "1" after 15 consecutive zeros, while the marker addition unit 104 and the appearance change permitting unit 109 both on the receiving terminal B may have a function of ignoring the bit value 1 inputted after the appearance of 15 consecutive zeros, thus avoiding confusion in distinguishing between the markers and the main data.
  • FIG. 3 shows another type of marker for which an undefined bit string (10001111) is used as the operation code whose length is fixed to 8 bits. Even if variable-length plotting coordinate data incidentally has the same bit pattern as the marker, the confusion can be avoided in such a manner that the marker addition unit 104 on the transmitting terminal A outputs the bit pattern twice, while the equivalent units on the receiving terminal B ignore the second bit pattern. Image data can be coped with in the same manner as plotting coordinate data.
  • the marker addition unit 104 operates as follows:
  • the unit 104 resets a data counter (S401), and receives data either bit by bit or in predetermined bit groups from either the plot input unit 101 or the image data storage unit 102 (S402). Then the unit 104 counts the bit number of the data received and outputs each bit of the data to the data distribution unit 105 (S404) until the count value reaches the intervals (64 bits, for example) for adding markers (S403). When the count value comes to coincide with the intervals in the mean time, the unit 104 adds markers to the data and outputs the marker-added data to the data distribution unit 105 (S406). This process is repeated every time it is required. If the input of data to be transmitted ends before the count value reaches the intervals for adding markers (S405), then the unit 104 terminates its operation without adding a marker.
  • Data to be added markers by the marker addition unit 104 includes training data stored in the image data storage unit 102 besides data to be transmitted such as still picture stored in the image data storage unit 102 and plotting coordinate data inputted from the plot input unit 101.
  • the data distribution unit 105 outputs the marker-added data received from the marker addition unit 104 intact to both the communication unit 106 and a distinguishable display control unit 107.
  • the same unit 105 receives marker-added data from the communication unit 106 and outputs it intact to the distinguishable display control unit 107. It is preferable that the unit 105 outputs the marker-added data to both units 106 and 107 at the same timing.
  • the communication unit 106 connects a plurality of communication terminals over transmission paths to form intercommunication of data/control signals and audio signals.
  • the distinguishable display control unit 107 makes a display unit 108 display the marker-added data received from the data distribution unit 105 in changed display appearance; for example, when the data is supposed to be displayed in black, a part of the data is displayed in gray. And every time the same part which is displayed in gray on the transmitting terminal A has become visible on the receiving terminal B, it is notified to the appearance change permitting unit 109 by the distinguishable display control unit 107. And every time the unit 107 receives a signal permitting a change of the appearance of the data on display from the unit 109, each part displayed in gray on the transmitting terminal A is sequentially returned to black. When no more gray display data is left, the distinguishable display control unit 107 notifies it to the appearance change permitting unit 109.
  • the same unit 107 outputs marker-added data received from the data distribution unit 105 to the display unit 108, and every time one part of the segmented data becomes visible on the receiving terminal B, it is notified to the appearance change permitting unit 109 by the unit 107.
  • the determination of a visible display on a terminal is based on the conventional enabling of the display terminal.
  • the appearance change permitting unit 109 waits for a reply that a part has become visible on the display unit 108 which should be sent from the distinguishable display control unit 107 and another reply that the same part as has become visible on the display unit 108 has become visible on the receiving terminal B which should be sent from the communication unit 106. When both the replys are acquired, the unit 109 outputs appearance change permitting information to the distinguishable display control unit 107.
  • the appearance change permitting unit 109 judges whether the difference between a time required to get the reply that a part of the segmented training data has become visible on the display unit 108 and another time required to get the other reply that the same part of the data has become visible on the receiving terminal B is within a permissible range or not.
  • the unit 109 also judges whether a time required for transmitting/receiving the entire training data depending on the number of the markers to be added thereto is within a permissible range or not.
  • the unit 109 notifies the marker addition unit 104 that the training is over, and otherwise outputs information on adding markers at the intervals considered to be better for synchronization to the marker addition unit 104 in a manner described later.
  • the same unit 109 outputs a reply to the communication unit 106 that a part of data has become visible on the display, which is received from the distinguishable display control unit 107.
  • the time X required for making one part of data corresponding to the amount D visible on the transmitting terminal A is:
  • ta is the speed at which a displaying operation is processed in the transmitting terminal A and "*" is an operator indicating a product.
  • the time Y elapsed from when the transmitting terminal A starts to transmit the part for the amount D to the receiving terminal B until the terminal A receives a reply of the reception from the terminal B is:
  • tb is the speed at which a displaying operation is processed in the receiving terminal B
  • S is the speed at which a transmitting operation is processed over the path between the transmitting terminal A to the receiving terminal B
  • F is the time required for the receiving terminal B to transmit a reply that the part for the amount of D has become visible on the display thereof to the transmitting terminal A.
  • the time difference T between a time required for making the part for the amount D visible on the transmitting terminal A and another time required for making the same part visible on the receiving terminal B is:
  • the following is a method for determining the best intervals for adding markers.
  • the appearance change permitting unit 109 waits for the reply at a part of training data has become visible on its own terminal display which is sent from the distinguishable display control unit 107 and another reply that the same part has become visible on the receiving terminal B which is sent from the communication unit 106. When both the replys are acquired, the unit 109 outputs appearance change permitting information to the distinguishable display control unit 107. Receiving a reply that one part of the training data is visible on the receiving terminal B, the unit 109 finds the difference between the time X and the time Y, or
  • the unit 109 outputs information on adding markers at shorter intervals to the marker addition unit 104. This output of training data is continued until the time difference is judged to be within the permissible range.
  • transmission of data is processed as follows:
  • the marker addition unit 104 refers to the initial value of the intervals for adding markers pre-determined as a parameter (S501).
  • the unit 104 then segments image data, which is held as training data in the image data storage unit 102, into a plurality of parts and adds a marker between each part at the predetermined intervals and outputs a part of the data to the data distribution unit 105 (S502).
  • the data distribution unit 105 outputs a part with a marker to the receiving terminal B and outputs the part to the distinguishable display control unit 107 and the receiving terminal B simultaneously (S503).
  • the distinguishable display control unit 107 causes the display unit 108 to display the marker-added part in gray (S504) and also seeks a marker (S505).
  • the unit 107 detects the marker, then it is judged whether the part has become visible on the display unit 108 or not. When it has, it is notified to the appearance change permitting unit 109 (S506). After this, the unit 109 waits for a reply that the part has become visible on the receiving terminal B to be sent therefrom (S507). Receiving the reply, the appearance change permitting unit 109 outputs appearance change permitting information to the distinguishable display control unit 107 (S508), and then returns the part displayed in gray to black (S509).
  • the above-mentioned process is carried out for the marker-added entire training data. If the marker detected is the last added, no more part displayed in gray being left (S510), then it is notified to the appearance change permitting unit 109 (S511). The unit 109 confirms the reply to be for the training data (S512), and then judges whether or not the
  • the appearance change permitting unit 109 outputs information on adding markers at shorter intervals to the marker addition unit 104 (S515) and resumes the operations in S502-S512 for the training data which is to add markers at the shortened intervals. This is repeated until the requirement
  • T)*the number of markers (n) is within the allowable time range ⁇ 2 or not (S517). If T*n ⁇ 2, then the unit 109 outputs information on adding markers at expanded intervals to the marker addition unit 104 (S518).
  • the marker addition unit 104 adds markers to plotting data or image data at the intervals determined by the marker addition interval information of the unit 109 and outputs the marker-added data to the data distribution unit 105 (S521).
  • the operations in S503-S511 are repeated the same number of times as the number of markers to add to data so as to complete the transmission operation.
  • the communication unit 106 receives marker-added data from the transmitting terminal A (S601) and then outputs the received data to the data distribution unit 105.
  • This unit 105 outputs the data to the distinguishable display control unit 107 (S602).
  • This unit 107 outputs the data to the display unit 108 (S603), and simultaneously seeks the marker to judge whether a part of the data has been visible on the display unit 108 (S604-S605). After it is visualized, it is notified to the appearance change permitting unit 109.
  • This unit 109 outputs this reply to the transmitting terminal A via the communication unit 106 (S605).
  • the operations in S604-S605 are repeated until the part added the last marker has been visible (S607).
  • FIG. 7(a) and (b) respectively show the transition of display appearance at the transmitting terminal A and the receiving terminal B when the sender drew a straight line L.
  • the portion L 1 is displayed in gray on the transmitting terminal A as shown in FIG. 7(a)(left).
  • the first portion L 0 already displayed on the receiving terminal B is displayed in black.
  • the receiving terminal B has not received the part of the data corresponding to the portion L 1 yet so that only the first portion L 0 is visible on the receiving terminal B as shown in FIG. 7(b)(left).
  • the time Y in the equation (2) elapses from the time t 0 , the part corresponding to the portion L 1 reaches the receiving terminal B and as a result, the portion L 1 is displayed in black as shown in FIG. 7(b)(right).
  • the portion L 1 becomes visible on the receiving terminal B, it is notified to the transmitting terminal A and the portion L 1 is displayed in black on the transmitting terminal A as shown in FIG. 7(a)(right).
  • the portion L 1 is changed from gray to black on the transmitting terminal A shown in FIG. 7(a) (right) and the same portion L 1 becomes visible on the receiving terminal B shown in FIG. 7(b)(right); the former is delayed because of the time required for the transmitting terminal A to receive a reply that the part has become visible on the receiving terminal B.
  • the portion L 1 is displayed in gray from the start point of being drawn on the transmitting terminal A, so that the conformity of display on both terminals can be confirmed at latest when the portion L 1 has been changed to black as mentioned.
  • inconvenience caused by the time delay between the display of data on a transmitting terminal A and the display of the same data on a receiving terminal B can be eliminated.
  • FIG. 8(a) and (b) respectively show the transition of display appearance at the transmitting terminal A and the receiving terminal B when image data is transmitted. Time proceeds from the reference numbers 1 to 4 in both (a) and (b). The comparison between (a) and (b) proves the guarantee of the conformity.
  • the data is actually sent with markers in the embodiment, information on intervals to add markers may be predetermined instead and commonly owned by both terminals.
  • the data is segmented into parts using the information and each part is displayed in gray until the transmitting terminal A receives a reply that each part has become visible on the receiving terminal B.
  • the receiving terminal B receives the data added no marker from the transmitting terminal A and segments the data using the information. And every time a part becomes visible on the receiving terminal B, it is notified to the transmitting terminal A.
  • the distinguishable display control unit 107 changes display tones between already visualized data and not visualized data yet on the receiving terminal B even for training data in the embodiment, the appearance for each of them does not need to be distinguished and only a reply may be received every time a part has been visible.
  • plot data consecutively inputted from the plot input unit 101 may be used instead.
  • each one part of training data added markers at different length of intervals may be transmitted by turns, so that it may be judged whether the first requirement is met or not for each one part and then one having the best interval among them may be selected.

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  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Controls And Circuits For Display Device (AREA)
  • Communication Control (AREA)
  • Facsimiles In General (AREA)
  • Facsimile Transmission Control (AREA)
  • Electrically Operated Instructional Devices (AREA)
US08/077,250 1992-06-12 1993-06-14 Synchronous display control apparatus Expired - Lifetime US5469183A (en)

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JP4153875A JPH05347674A (ja) 1992-06-12 1992-06-12 同期表示制御装置
JP4-153875 1992-06-12

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EP0576183B1 (fr) 2002-09-25
DE69332326D1 (de) 2002-10-31
DE69332326T2 (de) 2003-01-23
JPH05347674A (ja) 1993-12-27
EP0576183A1 (fr) 1993-12-29

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